Free vn_tools calculators to help your business grow.
Estimate the approximate Vietnamese lunar calendar date from a solar (Gregorian) date. Enter a year (2020–2027), month, and day to get the estimated lunar month and day. Note: this uses a simplified approximation based on the Lunar New Year offset — for exact dates, use a dedicated lunar calendar application.
Calculate both Vietnamese age systems from your birth year. Tuổi ta (tuổi đời) is the standard calendar age: current year minus birth year. Tuổi mụ is the traditional Vietnamese lunar age, which counts the birth year itself as year 1 — so a person born in 1990 is already 1 year old at birth and turns 2 on the next Lunar New Year. Tuổi mụ is commonly used in traditional ceremonies, paperwork, and cultural contexts in Vietnam.
Enter your birth year to find your Can Chi — the Heavenly Stem (Can) and Earthly Branch (Chi) from the Vietnamese/Chinese sexagenary calendar. The result shows two numeric indices; use the reference tables below to read the full name. Animal index (Chi): 0=Tý/Rat, 1=Sửu/Ox, 2=Dần/Tiger, 3=Mão/Rabbit, 4=Thìn/Dragon, 5=Tỵ/Snake, 6=Ngọ/Horse, 7=Mùi/Goat, 8=Thân/Monkey, 9=Dậu/Rooster, 10=Tuất/Dog, 11=Hợi/Pig Stem index (Can): 0=Giáp/Wood+, 1=Ất/Wood-, 2=Bính/Fire+, 3=Đinh/Fire-, 4=Mậu/Earth+, 5=Kỷ/Earth-, 6=Canh/Metal+, 7=Tân/Metal-, 8=Nhâm/Water+, 9=Quý/Water- Example: 1990 → animal_index=6 (Ngọ/Horse), stem_index=6 (Canh/Metal+) → Canh Ngọ.
Calculate the number of business days in any period by subtracting weekends and Vietnamese public holidays. Enter the total calendar days, the number of weekend days (Saturday + Sunday), and the number of public holidays falling on weekdays. Vietnam public holidays (11 days/year): Tết Nguyên Đán (5 days), Giỗ Tổ Hùng Vương 10/3 (1 day), Ngày Giải Phóng 30/4 (1 day), Ngày Quốc tế Lao động 1/5 (1 day), Quốc Khánh 2/9 (2 days).
Calculate how many years and months you have been married, and find out which anniversary year is next. Enter your wedding date and today's date to get the result. Western anniversary milestone names: 1=Paper, 5=Wood, 10=Tin/Aluminum, 15=Crystal, 20=China, 25=Silver, 30=Pearl, 40=Ruby, 50=Gold, 60=Diamond.
Convert your Vietnamese university score (10-point scale) to the international 4-point GPA scale. Vietnamese grading uses the following conversion table: 8.5–10 → 4.0 (A, Xuất sắc/Giỏi), 7.0–8.4 → 3.0 (B, Khá), 5.5–6.9 → 2.0 (C, Trung bình khá), 4.0–5.4 → 1.0 (D, Trung bình), 0–3.9 → 0.0 (F, Yếu/Kém). This calculator also shows the percentage equivalent of your score.
Estimate your Vietnamese university admission score (điểm xét tuyển) by combining three subject scores with priority points. Vietnam's university admission system adds area priority points (điểm ưu tiên khu vực): KV1 +0.75, KV2-NT +0.5, KV2 +0.25, KV3 +0. Group priority points (điểm ưu tiên đối tượng): UT1 +2.0, UT2 +1.0, UT3 +0. The final admission score equals the sum of three subject scores plus area and group priority points.
Calculate your monthly contribution for Vietnamese voluntary social insurance (bảo hiểm xã hội tự nguyện). Contributors pay 22% of their chosen income base (mức thu nhập tự chọn). The state provides subsidies for eligible households: 30% for poor households, 25% for near-poor households, and 10% for others in difficult areas. The minimum income base is the regional minimum wage (~1,800,000 VND/month for rural areas) and the maximum is 20× the basic salary (46,800,000 VND/month in 2025).
Plan your Tết red envelope (lì xì / bao lì xì) budget by entering the number of recipients and amount per group. This tool helps you estimate the total cost of giving lì xì to children, elders, and other family members during Tết Nguyên Đán. Enter your planned amounts for each group to see the total budget needed.
Plan your wedding gift (mừng cưới) budget by entering the number of weddings and your planned gift amount for each relationship group. This tool helps you estimate the total cost of giving wedding gifts to close family, friends, and colleagues throughout the year. Enter your planned amounts for each group to see the total budget needed.
Plan your housewarming gift (mừng tân gia) budget by entering the number of events and your planned gift amount for each relationship group. This tool helps you estimate the total cost of cash gifts and physical gifts for close family, friends, and colleagues moving into a new home.
Plan your funeral condolence gift (phúng viếng) budget by entering the number of occasions and your planned contribution for each relationship group. This tool helps you estimate the total cost of condolence gifts for close family, friends, and colleagues. Enter your planned amounts for each group to see the total budget needed.